#! /bin/sh
# 
# Laptop mode tools module: Intel AC97 integrated audio power saving mode.
#

if [ x$CONTROL_AC97_POWER = x1 ] || [ x$ENABLE_AUTO_MODULES = x1 -a x$CONTROL_AC97_POWER = xauto ]; then
	if [ -w /sys/module/snd_ac97_codec/parameters/power_save ]; then
		echo 1 > /sys/module/snd_ac97_codec/parameters/power_save
		log "VERBOSE" "AC97 power save mode enabled."
                if [ -c /dev/dsp ]; then
                        # This can fail if the audio device is busy.
                        # Since this failure is non-fatal (worst case is that the timer changes
                        # don't get activated), we don't bother if it was successful or not
                        #(exec 2>/dev/null; echo 1 > /dev/dsp;)
                        # Better way
                        echo 1 2>/dev/null >/dev/dsp
                        log "VERBOSE" "Initialize timer change by close/open /dev/dsp"
                fi
	else
		log "VERBOSE" "AC97 power saving is not available. Perhaps CONFIG_SND_AC97_POWER_SAVE option"
		log "VERBOSE" "is not set in the kernel config, or the snd_ac97_codec module is not loaded."
	fi
else
	log "VERBOSE" "AC97 audio power setting is disabled."
fi

